.page-about {
  --about-panel-grad: linear-gradient(160deg, rgba(18, 58, 94, 0.72), rgba(11, 35, 64, 0.88));
  font-family: var(--font-body);
  color: var(--text);
}

.page-about .breadcrumbs {
  margin-top: 18px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 30px 0 48px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 520px;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(58% 78% at 20% 34%, rgba(23, 224, 208, 0.22), transparent 70%),
    radial-gradient(52% 70% at 82% 8%, rgba(63, 123, 255, 0.20), transparent 72%),
    radial-gradient(40% 60% at 62% 62%, rgba(178, 107, 255, 0.12), transparent 74%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.2vw, 4.35rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 14px 0 0;
  max-width: 16em;
}

.page-about .about-hero__title em {
  font-style: normal;
  font-family: var(--font-mono);
  color: var(--cyan);
  text-shadow: 0 0 26px rgba(23, 224, 208, 0.42);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 46em;
  color: var(--text-dim);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 34px;
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border-radius: var(--r-m);
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(23, 224, 208, 0.10), rgba(63, 123, 255, 0.06));
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: 1.72rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .stat__label {
  font-size: 0.84rem;
  color: var(--text-dim);
}

/* ---------- 页面索引 ---------- */

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
  padding-bottom: 8px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: rgba(11, 35, 64, 0.62);
  color: var(--text);
  font-size: 0.88rem;
  text-decoration: none;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(23, 224, 208, 0.10);
  transform: translateY(-2px);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--cyan);
}

/* ---------- 区块壳 ---------- */

.page-about .about-sec {
  padding: 56px 0;
}

.page-about .about-sec .section__head {
  margin-bottom: 8px;
}

/* ---------- 01 起点与版图 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-origin__prose p {
  margin: 0 0 18px;
}

.page-about .about-origin__prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin__panel .panel__body {
  padding: 6px 0;
}

.page-about .factlist {
  margin: 0;
  padding: 0;
}

.page-about .factlist__row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .factlist__row:last-child {
  border-bottom: 0;
}

.page-about .factlist dt {
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

.page-about .factlist dd {
  margin: 0;
  font-size: 0.98rem;
  color: var(--text);
}

.page-about .factlist dd.mono {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 1.1rem;
}

/* ---------- 02 时间轴 ---------- */

.page-about .about-sec--tl {
  position: relative;
}

.page-about .tl {
  position: relative;
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 6px;
  bottom: 6px;
  width: 2px;
  transform: translateX(-1px);
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(23, 224, 208, 0.55), rgba(63, 123, 255, 0.22) 55%, rgba(23, 224, 208, 0.34));
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 60px minmax(0, 1fr);
  align-items: start;
  padding-bottom: 34px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item__card {
  grid-column: 1;
  padding: 22px 22px 20px;
  border-radius: var(--r-l);
  border: 1px solid var(--line-soft);
  background: var(--about-panel-grad);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .tl-item__card:hover {
  border-color: rgba(23, 224, 208, 0.42);
  transform: translateY(-3px);
}

.page-about .tl-item__pin {
  grid-column: 2;
  justify-self: center;
  padding-top: 26px;
}

.page-about .tl-item__pin span {
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(23, 224, 208, 0.12), 0 0 18px rgba(23, 224, 208, 0.45);
}

.page-about .tl-item__meta {
  grid-column: 3;
  padding: 20px 0 0 26px;
}

.page-about .tl-item--right .tl-item__card {
  grid-column: 3;
}

.page-about .tl-item--right .tl-item__meta {
  grid-column: 1;
  text-align: right;
  padding: 20px 26px 0 0;
}

.page-about .tl-item__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .tl-item__tag {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.page-about .tl-item__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.page-about .tl-item__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .tl-item__media {
  margin: 0 0 14px;
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .tl-item__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 03 技术与生产 ---------- */

.page-about .about-tech__grid {
  display: grid;
  gap: 26px;
  margin-top: 32px;
}

.page-about .about-tech__text {
  margin: 0 0 24px;
}

.page-about .about-tech__media {
  margin: 0;
  border-radius: var(--r-l);
  overflow: hidden;
}

.page-about .about-tech__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-tech__side .panel__body {
  padding: 20px 18px 18px;
}

.page-about .donut {
  display: block;
  width: 168px;
  height: 168px;
  margin: 0 auto 14px;
  transform: rotate(-90deg);
}

.page-about .donut__track {
  fill: none;
  stroke: rgba(143, 166, 191, 0.16);
  stroke-width: 14;
}

.page-about .donut__seg {
  fill: none;
  stroke-width: 14;
  transition: stroke-width 0.25s var(--ease);
}

.page-about .donut__seg:hover {
  stroke-width: 19;
}

.page-about .donut__seg--1 { stroke: var(--cyan); }
.page-about .donut__seg--2 { stroke: var(--blue); }
.page-about .donut__seg--3 { stroke: var(--gold); }
.page-about .donut__seg--4 { stroke: var(--violet); }

.page-about .donut-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .donut-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-dim);
}

.page-about .donut-legend b {
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text);
}

.page-about .donut-legend__key {
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.page-about .donut-legend__key--1 { background: var(--cyan); }
.page-about .donut-legend__key--2 { background: var(--blue); }
.page-about .donut-legend__key--3 { background: var(--gold); }
.page-about .donut-legend__key--4 { background: var(--violet); }

.page-about .steps {
  counter-reset: step;
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .steps__item {
  padding: 18px 18px 16px;
  border-top: 2px solid var(--cyan-deep);
  border-radius: 0 0 var(--r-m) var(--r-m);
  background: linear-gradient(180deg, rgba(18, 58, 94, 0.55), rgba(11, 35, 64, 0.22));
}

.page-about .steps__item::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .steps__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
}

.page-about .steps__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 04 服务网络 ---------- */

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .filter-btn {
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: transparent;
  color: var(--text-dim);
  font-family: inherit;
  font-size: 0.86rem;
  cursor: pointer;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .filter-btn:hover {
  color: var(--text);
  border-color: var(--cyan-deep);
}

.page-about .filter-btn[aria-pressed="true"] {
  color: var(--text);
  border-color: var(--violet);
  background: rgba(178, 107, 255, 0.14);
  box-shadow: 0 0 0 1px rgba(178, 107, 255, 0.32);
}

.page-about .about-net__grid {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .net-map {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}

.page-about .net-region {
  padding: 14px 14px 16px;
  border-radius: var(--r-m);
  border: 1px solid var(--line-soft);
  background: rgba(11, 35, 64, 0.66);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .net-region:hover {
  border-color: rgba(23, 224, 208, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(6, 20, 40, 0.55);
}

.page-about .net-region.is-filtered-out {
  display: none;
}

.page-about .net-region.is-pop {
  animation: aboutPop 0.4s var(--ease) both;
}

.page-about .net-region__name {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--text);
}

.page-about .net-region__name .mono {
  font-family: var(--font-mono);
  color: var(--gold);
  margin-left: 4px;
}

.page-about .net-region__dots {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.page-about .net-region__dots span {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: linear-gradient(140deg, var(--cyan), var(--blue));
  box-shadow: 0 0 8px rgba(23, 224, 208, 0.38);
}

.page-about .about-net__side {
  display: grid;
  gap: 18px;
}

.page-about .about-net__media {
  margin: 0;
  border-radius: var(--r-l);
  overflow: hidden;
}

.page-about .about-net__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .netfacts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .netfacts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.9rem;
  color: var(--text-dim);
}

.page-about .netfacts li:last-child {
  border-bottom: 0;
}

.page-about .netfacts b {
  color: var(--text);
  font-weight: 700;
}

.page-about .netfacts b.mono {
  font-family: var(--font-mono);
  color: var(--cyan);
}

/* ---------- 05 资质与伙伴 ---------- */

.page-about .badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .badge {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid rgba(242, 180, 68, 0.5);
  background: linear-gradient(140deg, rgba(242, 180, 68, 0.12), rgba(242, 180, 68, 0.03));
  font-size: 0.92rem;
  color: var(--text);
}

.page-about .badge b {
  font-family: var(--font-mono);
  font-size: 1.16rem;
  color: var(--gold);
}

.page-about .about-cred__text {
  margin-top: 30px;
}

.page-about .about-cred__text p {
  margin: 0 0 18px;
}

.page-about .about-cred__text p:last-child {
  margin-bottom: 0;
}

/* ---------- 06 合作方式 ---------- */

.page-about .coop-grid {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .coop-card {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 26px 24px 24px;
  border-radius: var(--r-l);
  border: 1px solid var(--line-soft);
  background: linear-gradient(165deg, rgba(18, 58, 94, 0.7), rgba(6, 20, 40, 0.9));
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .coop-card:hover {
  border-color: rgba(23, 224, 208, 0.42);
  transform: translateY(-3px);
}

.page-about .coop-card::after {
  content: "";
  position: absolute;
  right: -30%;
  bottom: -48%;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(23, 224, 208, 0.18), transparent 70%);
}

.page-about .coop-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.24rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .coop-card__for {
  margin: 8px 0 16px;
  font-size: 0.84rem;
  color: var(--gold);
}

.page-about .coop-card__step {
  position: relative;
  z-index: 1;
  margin: 0 0 24px;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .coop-card .btn {
  position: relative;
  z-index: 1;
  align-self: flex-start;
  margin-top: auto;
}

.page-about .about-coop__note {
  margin: 30px 0 0;
  padding: 20px 22px;
  border-radius: var(--r-m);
  border-left: 3px solid var(--cyan);
  background: rgba(11, 35, 64, 0.55);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-coop__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 224, 208, 0.4);
}

.page-about .about-coop__note a:hover {
  color: var(--text);
  border-bottom-color: var(--text);
}

@keyframes aboutPop {
  from { opacity: 0; transform: scale(0.94); }
  to { opacity: 1; transform: scale(1); }
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 44px 0 60px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 860px) {
  .page-about .coop-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-sec {
    padding: 78px 0;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-tech__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .about-net__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }
}

@media (max-width: 859px) {
  .page-about .tl::before {
    left: 15px;
    transform: none;
  }

  .page-about .tl-item {
    grid-template-columns: 32px minmax(0, 1fr);
    padding-bottom: 26px;
  }

  .page-about .tl-item__pin {
    grid-column: 1;
    grid-row: 1 / span 2;
    justify-self: start;
    align-self: start;
    padding-top: 24px;
  }

  .page-about .tl-item__meta,
  .page-about .tl-item--right .tl-item__meta {
    grid-column: 2;
    grid-row: 1;
    text-align: left;
    padding: 0 0 10px 16px;
  }

  .page-about .tl-item__card,
  .page-about .tl-item--right .tl-item__card {
    grid-column: 2;
    grid-row: 2;
    margin-left: 16px;
  }

  .page-about .tl-item__year {
    font-size: 1.4rem;
  }
}

@media (max-width: 560px) {
  .page-about .about-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .net-map {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }

  .page-about .coop-card .btn {
    align-self: stretch;
  }
}